Touch delay switch a circuit diagram of a NAND gate consisting

Description: The touch delay switch, as illustrated in the figure, is composed of a CMOS NAND gate and is capable of providing a delay of approximately 10 seconds. It is commonly utilized for the automatic control of lighting in street corridors and home entrances.

The touch delay switch circuit employs a CMOS NAND gate as its primary component, which is responsible for the logical operation and delay functionality. The circuit typically includes a capacitor, resistor, and a momentary switch to achieve the desired delay effect. When the switch is activated, the capacitor begins to charge through the resistor, creating a time delay before the output of the NAND gate transitions.

The configuration of the circuit ensures that the output remains low until the capacitor reaches a certain voltage level, at which point the NAND gate output will switch to high, activating the connected load, such as a light fixture. The time delay can be adjusted by changing the values of the resistor and capacitor, allowing for customization based on specific application requirements.

This design is particularly advantageous for applications in corridors and doorways, where automatic lighting can enhance safety and convenience. The use of CMOS technology ensures low power consumption, making the circuit efficient for prolonged use in residential and public lighting systems. As shown in FIG touch delay switch is a CMOS NAND gate composition, can delay about 10 seconds, often used in street corridor, home door lights automatic control.